code: def test_one_fuse_reduction_premap(self, xp):
      def impl(x, y):
          premap = x + y
          return xp.sum(premap, axis=0)
  
      return impl
  
imports: import unittest
  from unittest import mock
  import cupy
  from cupy import testing
  from cupy_tests.core_tests.fusion_tests import fusion_utils
label_desc: Use image node_id 17 for calling the TestOptimizations obj's underlying member method code with example usage: obj.test_one_fuse_reduction_premap(xp) and returns: impl, xp